In general the Coast Guard and professional mariners monitor frequencies between 4 and 25 megahertz.

2182 kHz

channel 16

It uses FM channels in the very high frequency (VHF) radio band in the frequency range between 156 and 174 MHz, inclusive, designated by the International Telecommunication Union as the VHF maritime mobile band.

It is illegal to operate a marine radio on land. There are two basic types of VHS Marine Radios, fixed mount and handheld. Fixed mount radios are installed or mounted in your vessel. Handheld radios are carried with you like any other handheld two way radio or walkie-talkie.

Federal Communications Commission regulations require boaters having VHF radios to maintain a watch on either channel 9 or channel 16, whenever the radio is turned on and not communicating with another station. All non-emergency traffic should be communicated on another channel (not channels 9 or 16).

If you have radio telex, your ship’s transmit frequencies are: 2 502, 4 173.5, 4 176, 6 271, 8 388.5, 12 498.5, 16 692.5, 22 316. Non-SSB (i.e. Broadcast Stations’) ‘Time’ signal are on 2.5 , 5.0, 10.0, 15.0, 20.0, and 25.0 MHz at various times of day.

Perform a radio check to ensure your unit is functioning properly—do not use channel 16 this. Use an “open channel” to performance the check (channels 68, 69, 71, 72 and 78A). Turn radio to one-watt power setting, and key the microphone. Call “radio check” three times, followed by your boat name and location.

Most VHF radios on the market today have in excess of twenty twenty-five usable channels. Aside from the U.S. channels there are also International and Canadian channels, all of which come standard with many of the newer units on the market. The most important channels on your VHF radio are 13, 16, 19, 22, and 70.

A VHF radio will not allow you to do a broadcast to anyone who is not operating on the same channel as you. My answer: I have both a VHF/Ham radio and a CB radio in my Jeep. I can talk to anyone on the police frequencies we use for SAR and still communicate on the ground with CB frequency when needed.

The VHF Marine Band is a global frequency allocation from 156.000-Mhz to about 162.0375-MHz. In the initial division of the band into channels, each channel was allowed a bandwidth of 0.050-MHz or 50-kHz. The wide spacing helps to insure that signals on adjacent channels do not interfere.

Marine and CB radios are not the same and are used for two similar yet different purposes. CB radios are often used during large emergencies, such as natural disasters, and for traffic concerns. Marine radios (VHF) are used for boating purposes and are typically required on all boats before leaving land.

The citizens band radio service originated in the United States as one of several personal radio services regulated by the Federal Communications Commission (FCC). In 1948, the original CB radios were designed for operation on the 460–470 MHz UHF band.

Yes you can talk at least 50 miles on Single Side Band with a proper antenna. 150 miles is a stretch, I know that the FCC rules state that it is a 150 mile range. It can happen but not very often. Usually the “skip propagation” will let CB radios talk great distances.

Marine Radios are cheap and powerful. Therefore, having a marine radio mounted in your truck is ILLEGAL! (2) If you are carrying a marine handie talkie, and you are not in a boat that is in the water, and not walking on water, then you are “on land”. Therefore, having the marine handie talkie is ILLEGAL!

The 5 watt radio can reach up to 12 miles or more. Some handheld radios have 6 watts which can reach up to 20 miles in the right conditions.

The Communications Act of 1934 (the “Act”) prohibits anyone from transmitting “energy or communications or signals by radio within the United States except under and in accordance with the Act and with a license.” CB operators are not required to have a license because the FCC’s rules authorize their operation, but …

But overall, VHF radios are better for outdoor use in large areas, and UHF radios are better for indoor or outdoor settings that are in close proximity. The General Mobile Radio Service (GMRS) is a land-mobile FM UHF radio service designed for short-distance two-way communication.

Police broadcast on frequencies in the UHF band. You are legally allowed to listen to unencrypted transmissions in these bands, but you need a license to broadcast.

Starting in 2017, the FCC separated FRS and GMRS. They now allow a maximum of 2 watts on FRS radios, 5 watts on handheld GMRS radios, and 50 watts on non-handheld GMRS radios. They claim that the FCC licensing requirement on GMRS will now be enforced.

Typically though, most GMRS radios use between 1 and 5 watts of power. Their range is a bit better than FRS radios, with typical hand-held devices being somewhere in the 1-2 mile window. Some mobile units with higher antennas can have a range up to 5 miles.

Compared with GMRS (General Mobile Radio Service) at 460 MHz: GMRS handheld radios have typically two to five watts transmitter power. At MURS frequencies, signals bend over hills better, but GMRS signals are better at bouncing off of surfaces and penetrating into/escaping out of buildings.

Although the max power has been increased to 2 watts on these “bubble-pack” radios for GMRS channels(per FCC 2017), IT IS STILL ILLEGAL to transmit on GMRS channels WITHOUT a license.

You can get a GMRS license for around $70 that is good for five years from the FCC. This license is good for you and your family. So other than being legal, getting a license is easy and the reason to get one can be summed up in a few words. Repeaters.

The fate of this radiation in the body depends on its wavelength: Visible light is usually scattered and is only strongly absorbed by some components such as pigments and blood. Our skin is well adapted to the harmful effects of ultraviolet radiation and the damaged molecules and cells are usually repaired or replaced.

The most restrictive limits on whole-body exposure are in the frequency range of 30-300 MHz where the human body absorbs RF energy most efficiently when the whole body is exposed.

Research Proves Tin Foil Hats Do Not Prevent; Increase Ease of RF “Mind Control” In 2005, a group of MIT students tested the effectiveness of foil helmets at blocking various radio frequencies by constructing three different helmet designs out of layers of aluminum foil.

Steps to Reduce Radio Frequency (RF) Exposure

1. Reduce the amount of time spent using your cell phone.
2. Use speaker mode, head phones, or ear buds to place more distance between your head and the cell phone.
3. Avoid making calls when the signal is weak as this causes cell phones to boost RF transmission power.

The polymer is 11 percent gold by weight, and the gold atoms in the substance efficiently scatter or absorb most forms of radiation, including X-rays. Chemically incorporated into a polymer, gold is less poisonous than other heavy metals that also block radiation.